Designation:D4716/D4716M−22StandardTestMethodforDeterminingthe(In-plane)FlowRateperUnitWidthandHydraulicTransmissivityofaGeosyntheticUsingaConstantHead1ThisstandardisissuedunderthefixeddesignationD4716/D4716M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thistestmethodcoverstheprocedurefordeterminingtheflowrateperunitwidthwithinthemanufacturedplaneofgeosyntheticsundervaryingnormalcompressivestressesandaconstanthead.Thetestisintendedprimarilyasanindextestbutcanbeusedalsoasaperformancetestwhenthehydraulicgradientsandspecimencontactsurfacesareselectedbytheusertomodelanticipatedfieldconditions.1.2Thistestmethodislimitedtogeosyntheticsthatallowcontinuousin-planeflowpathstooccurparalleltotheintendeddirectionofflow.1.3ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemarenotnecessarilyexactequivalents;therefore,toensureconformancewiththestandard,eachsystemshallbeusedindependentlyoftheother,andvaluesfromthetwosystemsshallnotbecombined.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafety,health,andenvironmentalpracticesanddeter-minetheapplicabilityofregulatorylimitationspriortouse.1.5Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)Committee.2.ReferencedDocuments2.1ASTMStandards:2D4354PracticeforSamplingofGeosyntheticsandRolledErosionControlProducts(RECPs)forTestingD4439TerminologyforGeosyntheticsD4491/D4491MTestMethodsforWaterPermeabilityofGeotextilesbyPermittivityD5092...
